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Slope lock in gear box 
Patent application no. - 396/BOM/96

Slope lock in gear box Prevents backward trailing on slopes.  The lock stops working after vehicle is set in motion in desired direction.

The lock is a Ratchet-Paul mechanism that stops the main shaft of transmission from revolving in reverse direction.
This prevents the vehicle from moving backward (it prevents forward motion if vehicle is in reverse mode).





Another version with electromagnetic lock. When gear is in clockwise direction an electromagnet holds the lock allowing gear to rotate. Once rotation stops, electromagnet release the lock so that gear is locked and cannot move in anti-clockwise direction.